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M ® ® M M ® = <br />HISTORICAL SUMMARY OF MON <br />VADOSE ZONE <br />NORTH COUNTY SANITARY LAN <br />VZ -4 <br />Units: mg/I, unless noted <br />Sample Designation VZ-4A/B VZ-4A/B VZ-4A/B VZ-4A/B <br />Sampling Date 10/27/98 3/2/00 1/10/01 4/12/01 <br />Monitoring and Field Parameters <br />Metals <br />Aluminum, Total <br />NA <br />NA <br />NA <br />NA <br />Antimony, Total <br />NA <br />NA <br />NA <br />NA <br />Arsenic, Total <br />NA <br />NA <br />NA <br />NA <br />Boron <br />NA <br />NA <br />NA <br />NA <br />Barium, Total <br />NA <br />NA <br />NA <br />NA <br />Beryllium, Total <br />NA <br />NA <br />NA <br />NA <br />Cadmium, Total <br />NA <br />NA <br />NA <br />NA <br />Chromium, Total <br />NA <br />NA <br />NA <br />NA <br />Chromium Hexavalent <br />NA <br />NA <br />NA <br /><0.0018 <br />Cobalt, Total <br />NA <br />NA <br />NA <br />NA <br />Copper, Total <br />NA <br />NA <br />NA <br />NA <br />Iron, Total <br />NA <br />NA <br />NA <br />NA <br />Lead, Total <br />NA <br />NA <br />NA <br />NA <br />Magnesium, Total <br />NA <br />NA <br />NA <br />NA <br />Manganese, Total <br />NA <br />NA <br />NA <br />NA <br />Nickel Total <br />NA <br />NA <br />NA <br />NA <br />Silver, Total <br />NA <br />NA <br />NA <br />NA <br />Selenium, Total <br />NA <br />NA <br />NA <br />NA <br />Sodium, Total <br />NA <br />NA <br />NA <br />NA <br />Tin, Total <br />NA <br />NA <br />NA <br />NA <br />Vanadium, Total <br />NA <br />NA <br />NA <br />NA <br />Zinc, Total <br />NA <br />NA <br />NA <br />NA <br />Only organic compounds detected <br />NA = Not Analyzed <br />